<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>列表渲染-过滤</title>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="vue.js"></script>
</head>
<body>
    <div id="root">
        <h2>人员列表</h2>
        <input type="text" v-model="keyWord">
        <button @click="sortType=2">年龄升序</button>
        <button @click="sortType=1">年龄降序</button>
        <button @click="sortType=0">原顺序</button>
        <ul>
            <li v-for="(p,index) in filPersons" :key="p.id">
                {{p.name}}-{{p.age}}--{{p.sex}}
            </li>
        </ul>
       
    </div>
   <script type="text/javascript">
    new Vue({
        el:'#root',
        data: {
            keyWord:'',
            persons:[
                {id:1, name:'马冬梅',age:28,sex:'女'},
                {id:2, name:'周冬雨',age:19,sex:'女'},
                {id:3, name:'周杰伦',age:20,sex:'男'},
                {id:4, name:'温兆伦',age:22,sex:'男'}
            ],
            // filPersons:[],
            sortType: 0 // 0 原 1降序 2升序
        },
        // watch:{
        //     // keyWord(val) {
        //     //     this.filPersons = this.persons.filter((p)=>{
        //     //        return p.name.indexOf(val) != -1
        //     //     })

        //     // }
        //     keyWord:{
        //         immediate: true,
        //         handler(val){
        //                 this.filPersons = this.persons.filter((p)=>{
        //            return p.name.indexOf(val) != -1
        //         })  
        //         }
        //     }
        // }
        computed: {
            filPersons() {
                const arr = this.persons.filter((p)=>{
              return p.name.indexOf(this.keyWord) != -1
             })
             if(arr && this.sortType) {
                arr.sort((p1, p2)=>{
                  return this.sortType === 1? p2.age - p1.age : p1.age - p2.age
                })
             }
             return arr
            }
        }
    })
   </script>
</body>
</html>